704 reputation
622
bio website
location United Kingdom
age
visits member for 3 years, 6 months
seen Dec 7 at 18:05

Manual worker. Live in England. Formal scientific education "peaked" many years ago when I failed maths and chemistry A-level and scraped a bare pass in physics. Still enjoy pottering about in maths and physics.


Aug
28
comment Textbook disagreement on geodesic deviation on a 2-sphere
Maybe I should have simply asked which of the two textbook equations of geodesic deviation is correct. Instead I tried to show effort by attempting an answer myself in the form of calculating the geodesic deviation on the surface of a unit 2-sphere. I wasn't confident about these calculation, hence my request for someone to take a look at them. I thus seem to have fallen into the “check my work” trap. As a self-studier, I can't say I feel encouraged by the negative responses to my question. Anyway, I'll try again with a rephrased question.
Aug
27
revised Textbook disagreement on geodesic deviation on a 2-sphere
added 776 characters in body
Aug
27
comment Textbook disagreement on geodesic deviation on a 2-sphere
Is my question controversial? It's been tagged as "Homework", but I'm in my sixth decade and haven't formally studied physics for forty years. I'm just curious as to whether I'm on the right track. Thanks.
Aug
27
revised Textbook disagreement on geodesic deviation on a 2-sphere
edited tags
Aug
27
asked Textbook disagreement on geodesic deviation on a 2-sphere
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
19
awarded  Necromancer
Jun
17
awarded  Yearling
Jun
5
comment Minkowski metric and definition of coordinate differentials?
Yes, I can see it now. Thanks.
Jun
5
comment Minkowski metric and definition of coordinate differentials?
Of course! I should have realised.
Jun
5
accepted Minkowski metric and definition of coordinate differentials?
Jun
5
asked Minkowski metric and definition of coordinate differentials?
Mar
27
awarded  Popular Question
Mar
12
awarded  Popular Question
Mar
10
awarded  Notable Question
Jan
28
awarded  Popular Question
Jan
8
awarded  Nice Question
Dec
19
accepted Riemann curvature tensor symmetries confusion
Dec
19
comment Riemann curvature tensor symmetries confusion
@StanLiou: Thanks. Final question. Can the Ricci tensor therefore be defined using other index permutations that don't involve the Riemann tensor having the same 1 and 2 or 3 and 4 indices as the metric, ie $R_{\mu\nu}=g^{\sigma\rho}R_{\sigma\mu\nu\rho}$ , $R_{\mu\nu}=g^{\sigma\rho}R_{\mu\sigma\rho\nu}$ , $R_{\mu\nu}=g^{\sigma\rho}R_{\mu\sigma\nu\rho}$ ?